C++ pointers learn by doing

#cpp   #c++  

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Table of Content

base on

• Pointer are just integer that point to memory address
• Pointer are type less, we provide types to pointer just to help the compiler to memory manipulation when we read and write to memory

Demo

point to zero

#include <iostream>

#define LOG(x) std::cout << x << std::endl;

int main() {
    int a = 10;
    void* ptr = nullptr;
    LOG(ptr);
}

point to variable on the stack

#include <iostream>

#define LOG(x) std::cout << x << std::endl;

int main() {
    int a = 10;
    void* ptr = &a;
    LOG(ptr);
}

Install memeory view

vscode extension: nateageek.memory-viewer

#include <iostream>

#define LOG(x) std::cout << x << std::endl;

int main() {
    int a = 10;
    int* ptr = &a;
    *ptr = 20;
    LOG(a);
}